Just like trees and rivers, weed wasn't invented but was first grown naturally and has existed longer than humans. the first group of people known to cultivate marijuana and smoke it for "religous cleansing" was the ancient Hindus of India.
in the late 60's "skunk" was created to promote cannabis and multiply the amount of THC in the cannabis flower.
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The original wild-type marijuana grew on the steppes of Central Asia. It was much less potent than the hybrids we use today. It was used by nomads who are mentioned in ancient travelogues of about 500 BC, and was probably used for five hundred years before that. The Scythians were a savage and violent people who used to drink their fallen enemy's blood from his own skull. They would pile marijuana plants on a communal fire and dance around it to either get ready to fight or celebrate a victory.
Most anthropologists will say that preliterate people discovered the virtue of medicinal plants by trial and error. But first-nation peoples (that scientists were able to interview before religious and economic leaders slaughtered them) say that they find the use of plant medicines by entering a trance and asking the plant. So we can imagine the first stoner as an ancient nomad group's shaman, newly arrived in a windswept endless grassland, asking the local plants how they could be useful.
Marijuana has been used by humans for more than 2,700 years. Nobody knows who the first person was to discover marijuana.